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Computers in a LAN are configured to use a symmetric key cipher within the LAN to avoid hardware address spoofing. This means that each computer share a different key with every other computer in the LAN. If there are 100 computers in this LAN, each computer must have at least:

a. 100 cipher keys

b. 99 cipher keys

c. 4950 cipher keys

d. 100000 cipher keys

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Answers (1)
  1. 30 November, 09:35
    0
    The correct answer is option (c) 4950 cipher keys

    Explanation:

    Solution

    Given that:

    From the given question we have that if there are 100 computers in a LAN, then each computer should have how many keys.

    Now,

    The number of computers available = 100

    The number of keys used in symmetric key cipher for N parties is given as follows:

    = N (N-1) / 2

    = 100 * (100 - 1) / 2

    = 50 * 99

    = 4950 cipher keys
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